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I Built an $80M Product in a Weekend

·Tim Moreton Jr

WisprFlow raised $80 million. I built the same thing in two days.

Not the business — the product. The part that actually transcribes your voice and cleans it up. That part is free now. Open source models + AI-assisted coding = one person, one weekend.

Here's YapperFlow.

What It Does

Cmd+T → talk → see text in your menu bar → Cmd+T again → clean text in your clipboard.

The cleanup is the part nobody else does locally. I added an on-device LLM — small, runs in Core ML, no API calls — that fixes grammar, kills the "ums," and pulls out summaries. "So I talked to Sarah and, uh, lunch moved to Thursday" becomes "Lunch moved to Thursday."

All local. Never hits a server. Never will.

The Stack

  • Parakeet for transcription. Better than Whisper for streaming (6% error vs 10%). Actually shows words as you say them, not in 5-second chunks.
  • Small LLM (~1.5B params) for cleanup. Grammar, filler removal, summary extraction. Runs on your Mac's Neural Engine.
  • SwiftUI for the app. ~750 lines. One weekend with Claude Code helping.

That's it. No backend. No database. No subscription.

The $80M Question

So what did WisprFlow actually raise money for? Not this part.

They raised for:

  • iOS, Android, Windows, Linux teams
  • Enterprise sales — Salesforce admins, legal compliance, HIPAA
  • Brand — "backed by Andreessen Horowitz"
  • Humans who answer emails when transcription screws up

I can't do any of that. But I don't need to.

The one-person company is back. You just need to pick battles you can win.

What's Good

  • Better than Apple's built-in transcription (which I used in my last app, Sticky Note Sync — it sucked)
  • Grammar cleanup actually works
  • Completely private — medical notes, legal stuff, personal journals stay on your machine
  • Free. No subscription. No ads. No tracking.
  • Open source. Apache license.

What's Not

  • Mac only. SwiftUI was the easy path for v1. Tauri for Windows/Linux later, maybe.
  • English-first. Parakeet v2 + the LLM both.

Download

Fork it. Break it. Add Windows support if you want — that's the #1 request.

The Real Lesson

The technology layer is free now. Open weights, AI coding tools, weekend shipping.

The hard part is everything else: distribution, trust, staying motivated when nobody's paying you.

But that's a different problem. And it's solvable too.

— Tim